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The electroneutral Na<jats:sup>+<\/jats:sup>,HCO<jats:sub>3<\/jats:sub><jats:sup>\u2212<\/jats:sup>\u2010cotransporter NBCn1\/Slc4a7 mediates net acid extrusion, and genetic variation in <jats:italic>SLC4A7<\/jats:italic> contributes to human hypertension and cardiovascular risk. Nonetheless, the cardiac consequences of disrupted NBCn1 expression and function remain unclear. Here, we test the hypothesis that NBCn1, either directly or indirectly, influences cardiac structure, contractile function, and electrophysiological properties.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Based on mice with global loss of NBCn1, we measure intracellular pH in atria and ventricles of the heart (fluorescence microscopy), membrane potential responses (patch clamping), electro\u2010 and echocardiographic variables, blood pressure (telemetry), and cardiac dimensions (in vivo and postmortem analyses).<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>We find that protein and mRNA expression of NBCn1 are more prominent in atrial than in ventricular cardiomyocytes. Disruption of NBCn1 expression lowers Na<jats:sup>+<\/jats:sup>,HCO<jats:sub>3<\/jats:sub><jats:sup>\u2212<\/jats:sup>\u2010cotransport activity more than 50% in atria without significantly influencing net acid extrusion activity of ventricular cardiomyocytes. Loss of NBCn1 is associated with hypertension (blood pressure increased by ~15\u2009mmHg), cardiac hypertrophy (heart\/body weight increased by ~10%), and prolonged ventricular isovolumic relaxation time (increased by ~25%). NBCn1 knockout does not affect cardiomyocyte size, collagen content in the heart wall, overall cardiac contractile function, electrophysiological properties of ventricular cardiomyocytes, or the electrocardiogram.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>NBCn1 is a main mechanism of Na<jats:sup>+<\/jats:sup>,HCO<jats:sub>3<\/jats:sub><jats:sup>\u2212<\/jats:sup>\u2010cotransport in atrial tissue and contributes substantially to net acid extrusion during intracellular acidification. NBCn1 does not play any major direct role in ventricular cardiomyocytes of unchallenged mice, but global knockout of NBCn1 increases systemic blood pressure and results in the development of cardiac hypertrophy.<\/jats:p><\/jats:sec>","DOI":"10.1111\/apha.70078","type":"journal-article","created":{"date-parts":[[2025,7,9]],"date-time":"2025-07-09T13:04:20Z","timestamp":1752066260000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Loss of Na<sup>+<\/sup>,<scp>HCO<sub>3<\/sub><\/scp><sup>\u2212<\/sup>\u2010Cotransporter <scp>NBCn1<\/scp> Inhibits Net Acid Extrusion in the Atria and Causes Hypertension\u2010Associated Cardiac Hypertrophy"],"prefix":"10.1111","volume":"241","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6618-7697","authenticated-orcid":false,"given":"Mar\u00eda S.","family":"Espejo","sequence":"first","affiliation":[{"name":"Department of Biomedicine Aarhus University  Aarhus Denmark"},{"name":"Centro de Investigaciones Cardiovasculares \u201cDr. Horacio Cingolani\u201d, Facultad de Ciencias M\u00e9dicas, Universidad Nacional de La Plata\u2010CONICET  Argentina"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Alejandro","family":"Orlowski","sequence":"additional","affiliation":[{"name":"Centro de Investigaciones Cardiovasculares \u201cDr. Horacio Cingolani\u201d, Facultad de Ciencias M\u00e9dicas, Universidad Nacional de La Plata\u2010CONICET  Argentina"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Trine M.","family":"S\u00f8rensen","sequence":"additional","affiliation":[{"name":"Department of Biomedicine Aarhus University  Aarhus Denmark"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3303-1095","authenticated-orcid":false,"given":"Vladimir V.","family":"Matchkov","sequence":"additional","affiliation":[{"name":"Department of Biomedicine Aarhus University  Aarhus Denmark"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8914-5067","authenticated-orcid":false,"given":"Ernesto A.","family":"Aiello","sequence":"additional","affiliation":[{"name":"Centro de Investigaciones Cardiovasculares \u201cDr. Horacio Cingolani\u201d, Facultad de Ciencias M\u00e9dicas, Universidad Nacional de La Plata\u2010CONICET  Argentina"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5078-9279","authenticated-orcid":false,"given":"Ebbe","family":"Boedtkjer","sequence":"additional","affiliation":[{"name":"Department of Biomedicine Aarhus University  Aarhus Denmark"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2025,7,9]]},"reference":[{"doi-asserted-by":"publisher","key":"e_1_2_10_2_1","DOI":"10.1016\/j.yjmcc.2008.10.024"},{"doi-asserted-by":"publisher","key":"e_1_2_10_3_1","DOI":"10.1113\/jphysiol.2004.071068"},{"doi-asserted-by":"publisher","key":"e_1_2_10_4_1","DOI":"10.1152\/ajpheart.00713.2005"},{"doi-asserted-by":"publisher","key":"e_1_2_10_5_1","DOI":"10.1113\/jphysiol.2012.249664"},{"doi-asserted-by":"publisher","key":"e_1_2_10_6_1","DOI":"10.1152\/ajpcell.00281.2007"},{"doi-asserted-by":"publisher","key":"e_1_2_10_7_1","DOI":"10.3389\/fcvm.2022.862118"},{"doi-asserted-by":"publisher","key":"e_1_2_10_8_1","DOI":"10.3390\/ijms25179610"},{"doi-asserted-by":"publisher","key":"e_1_2_10_9_1","DOI":"10.1038\/nature10405"},{"issue":"5","key":"e_1_2_10_10_1","first-page":"989","article-title":"Increased NBCn1 Expression, Na+\/HCO3\n                  \u2212 Co\u2010Transport and Intracellular pH in Human Vascular Smooth Muscle Cells With a Risk Allele for Hypertension","volume":"26","author":"Ng F. 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